public void SetArcSegmentItem(ArcSegmentItem item, double radius, double sin, double cos, Rect sectorRect)
{
item.Size = new Size(radius, radius);
item.StartPoint = new Point(sectorRect.Width / 2 - sin * radius, sectorRect.Height - cos * radius);
item.EndPoint = new Point(sectorRect.Width - sin * radius, sectorRect.Height - cos * radius);
item.StrokeThickness = 20.0;
}
private void ArrangeChildren(Size finalSize)
{
//开始考虑加入ItemsPanel, 这里transform的中心点还是不能用整个圆心做为中心点，不然的话不是以第一个item为开始
if (Children.Count == 0)
{
return;
}
var count = Children.Count;
//Get the radius of the available size.
double radius = Math.Min(finalSize.Width, finalSize.Height) * 0.5;
//child angle
double childAngle = 360.0 / (Math.Max((double)count, 2));
//sin
var sin = Sin(childAngle / 2);
//cos
var cos = Cos(childAngle / 2);
//SampleRect
var SampleRect = new Rect {
Width = 2 * sin * radius, Height = radius
};
SampleRect.X = radius - SampleRect.Width / 2.0;
//给当前Item的Arcsegment进行赋值
var baseitem = new ArcSegmentItem();
SetArcSegmentItem(baseitem, radius, sin, cos, SampleRect);
//loop
for (int i = 0; i < Children.Count; i++)
{
RadialMenuItem element = (RadialMenuItem)Children[i];
RotateTransform transform = new RotateTransform();
transform.CenterX = SampleRect.Width / 2.0;
transform.CenterY = SampleRect.Height;
//transform.CenterX = radius;
//transform.CenterY = radius;
var angle = childAngle * i;
transform.Angle = angle;
element.ArcSegments.BasePanel = baseitem;
element.ContentAngle = -angle;
element.RenderTransform = transform;
element.Arrange(SampleRect);
}
}